Lock.



H. NIELSEN.

. LOCK.

APPLICATION FILED NOV. 26, 1907.

Patented Nov. 5, 1912.

ISOLUMIIA PLANOGRAFH CD. WAIMINGNN. IL C- HERMAN NIELSEN, 0F COPENHAGEN,DENMARK.

LOCK.

Specification of Letters Patent.

Application filed November 26, 1907. Serial No. 403,838.

To all whom 'it may concern:

Be it known that I, HERMAN NIELSEN, a subject of the Kingdom of Denmark,residing at Ingemansvej 9, Copenhagen, Denmark, have invented a new anduseful Lock; and I do hereby declare the following to be a full, clear,and exact description of the same.

The invention relates to the so-called Brahma locks, in which the lockcan only be opened when the tumblers, which are provided with notches,have been displaced so as to make these notches lie in the same plane.The locks of this kind hitherto known have the disadvantages, that, onaccount of their construction, and more especially on account of themany parts of which they consist, the locks are too big and unhandy, forwhich reason they have not come much into use. Either the tumblersconsist of several parts arranged in different organs, which have to beturned in relation to each other, or the projectors preventing theturning, or the opening of the lock, are arranged on a special platewhich has to be screwed 011 to the body of the lock, which latter facthas also the effect that the lock can without much difficulty bedisjoined and consequently, opened, without the use of the key belongingto the lock. The present looking mechanism is, on the contrary,characterized by its exceedingly simple construction; it consists merelyof a hollow cylinder fastened to the lock-case itself, and which mayalso be in one piece with the lock-case, in which cylinder is arrangedthe rotatable cylinder containing the spring actuated tumblers, so that,besides the tumbler the lock contains only two bodies movable inrelation to each other. The arrangement can, therefore, be constructedvery small and be used in any kind of lock, and being at the same timecompletely secured against being taken apart from without or againstbeing opened without the use of the right ke T n the drawing Figure 1shows an axial section of the locking-mechanism, Figs. 2 and 3 showsections on the lines 2-2 and 3-3 of Fig. 1, Figs. 4: and 5 show the keyby an end view and a side view respectively.

The mechanism comprises the hollow cylinder 13, in which thelock'cylinder a is inserted. The cylinder 13 is shaped cylindricallyinside and has the shoulder a, the smooth wall below the said shoulderbeing,

turned in grooves 5.

however, interrupted by a number of integral projections 3 havingbetween them semi-circular recesses for the cylindrical tumblers, thenumber of which is the same as that of the tumblers. Above the shouldera is a horizontal annular groove 5 for the cam of the key, and from thelatter, a vertical groove 0 leads up to the end of the cylinder. Thelock-cylinder e which is inserted in the cavity of the cylinder 13, islikewise cylindrical and of the same diameter as the cavity mentioned.It is provided with cylindrical borings, in which corresponding tumblersg are inserted. These cylindrical tumblers carry, at the bottom, guidingpins 71, for the spiral springs j, which rest, at the top, against theshoulders d thus formed, so that the tumblers are always carried as farinward as they can get, that is, until they push partly against theshoulder a on the cylinder 13 and partly against a small shoulder 7a,which limits the borings in the lockcylinder 2. At different distancesfrom their upper ends, the tumblers g are provided with The outer wallsfor the borings of the tumblers in the lock-cylinder a are cut away atthe top so that a shoulder 6 is formed, whichrests against the underside of the projection 3. The cylinder 2 ends in a circular pivot fterminating adjacent one end of the cylinder 13 and forming a guide forthe cavity of the key (Figs. 4c and 5), which consists of a hollowcylinder 4, the free lower edge of which is provided with a number ofprojections 5, the length of which is adjusted in such'way that thenotches i, when the key is pressed entirely in, will stand exactly infront of the projections 3. The right position of the key is indicatedby a cam 7, which is first conveyed into the groove 0, and afterwardturned in the groove b. The lock-cylinder a is in suitable connectionwith a cam roll-back 17 intended for actuating the lock-bolt.

The roll-back 17 is in fixed connection with the cylinder 2, in theborings of which the tumblers g are inserted. This cylinder 2 cannotnormally be turned, because of the tumblers 9 being in the circularrecesses between the projections 3. If the key be now introduced, thegrooves 2' on the tumblers 9 will come opposite to the projections 3,and by the turning of the key the cylinder 2, and therewith theroll-back 17 also, will be turned, the projections 5 on the key 4 strik-Patented Nov.'5, 1912. i

ing against the side-walls of the borings in which the tumblers g areinserted.

What I claim is 1. In a mechanism of the character described, thecombination with a hollow cylinder 13 having an integral shoulder a, andprojections 3 having between them semicircular recesses, saidprojections 8 being integral with the cylinder and lying in the samehorizontal plane, of a cylinder 2, inserted in the cavity of cylinder 13and having cylindrical borings extending longitudinally of the cylinder2, and arranged circumferentially thereof, and the outer wall of thesaid borings being cut away to form shoulders 6 resting against theunderside of the projections 3, and said cylinder 2 having a centralprojecting portion forming a pivot terminating adjacent to one end ofcylinder 13, and being provided with a shoulder 70 lying in the samehorizontal plane as the shoulder a, cylindrical tumblers movablyarranged in the borings of cylinder 2 and the recesses intermediate theprojections 3, said tumblers being of a length to extend above the planeof the projections 3 and abutting against the said shoulders a, and is,and being provided above the said projections 3 with circumferentialgrooves 11, located at difi erent distances from the upper end of thetumblers said tumblers being adapted to be moved longitudinally to bringthe grooves 71, opposite the projections 3 to permit the cylinder 2 tobe turned, guiding pins projecting from the tumblers, and springssurrounding said pins and bearing against the tumblers for the purposeset forth.

2. In a mechanism of the character described the combination with ahollow cylinder 13 having an integral shoulder a, to-

ward its upper end and projections 3 on the inner wall below saidshoulder, and having between them semi-circular recesses, saidprojections 3 being integral with the cylinder and lying in the samehorizontal plane, of a cylinder 2, inserted longitudinally in the cavityof cylinder 13 and having cylindrical borings extending longitudinallyof cylinder 2, and arranged circumferentially thereof, and the outerwall of said borings being cut away to form shoulders 6 resting againstthe underside of projections 3, said cylinder .2, having a centralprojecting portion at its upper end forming a pivot terminating adjacentto the upper end. of cylinder 13 and being provided with a shoulder 7.1.lying in the same horizontal plane as shoulder a, cylindrical tumblersmovably arranged in the borings of cylinder 2 and the recessesintermediate the projections 3, said tumblers being of a length toextend above the plane of projections 3 and abutting against saidshoulders a, and 7a, and being provided above projections 3 withcircumferential grooves 2', located at different distances from theupper end of the tumblers. said tumblers being adapted to be movedlongitudinally to bring the grooves 2', opposite the projections 3 topermit cylinder 2 to be turned, guiding pins projecting from thetumblers, springs surrounding the pins and bearing against the tumblers,and a roll-back 17 in fixed connection with the cylinder 2, and adaptedto turn with the latter.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

HERMAN NIELSEN. Witnesses:

H. FLEIsoI-mn,

L. S. SUB.

i Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. G.

